I've got a few thousand miles on mine. When I pulled the original factory bearing at 70k, it came out with no problems, and the bearing spun smoothly. I sent it off to Charles at LN, and he confirmed that it was in good shape with a little bit of wear.
Did I have to replace mine? Probably not, but to me, this is a cheap insurance type of job.
The LN bearing is clearly of superior quality and far better engineered than the O.E. bearing (particularly by moving the sealing o-ring to the flange). While nothing is guaranteed in life, I'm pretty certain that my car has a FAR smaller chance of suffering an IMS failure now. Could it still blow up via other a different failure? Of course. Will it eventually wear out and need replacement or rebuilding? Of course.
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Boxster S
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